"Who are the militia, if they be not the people of this country...? I ask, who are the militia? They consist of now of the whole people, except a few public officers."

It doesn't really matter who the militia are.The Supreme Court settled the argument about Militia confusion:

Issue•What rights are protected by the Second Amendment?

Holding and Rule •The Second Amendment protects an individual right to possess a firearm unconnected with service in a militia, and to use that arm for traditionally lawful purposes, such as self-defense within the home.